scsi: docs: convert smartpqi.txt to ReST

Link: https://lore.kernel.org/r/00b398efb7cfc667b046fbef92a84f1d3c33eb64.1583136624.git.mchehab+huawei@kernel.org


Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>